Association of KRAS G13D Tumor Mutations With Outcome in Patients With Metastatic Colorectal Cancer Treated With First-Line Chemotherapy With or Without Cetuximab

作者: Sabine Tejpar , Ilhan Celik , Michael Schlichting , Ute Sartorius , Carsten Bokemeyer

DOI: 10.1200/JCO.2012.42.2592

关键词: Proportional hazards modelMedicineKRASSurvival analysisColorectal cancerOdds ratioOncologyInternal medicineCetuximabHazard ratioChemotherapy

摘要: Purpose We investigated in the first-line setting our previous finding that patients with chemorefractory KRAS G13D‐mutated metastatic colorectal cancer (mCRC) benefit from cetuximab treatment. Methods Associations between tumor mutation status (wild-type, G13D, G12V, or other mutations) and progression-free survival (PFS), survival, response were pooled data 1,378 evaluable CRYSTAL OPUS studies. Multivariate analysis correcting for differences baseline prognostic factors was performed. Results Of 533 (39%) KRAS-mutant tumors, 83 (16%) had 125 (23%) 325 (61%) mutations. Significant variations treatment effects found (P .005) PFS (P.046) G13D-mutant tumors versus all mutations (including G12V). Within subgroups, plus chemotherapy alone significantly improved (median, 7.4 v 6.0 months; hazard ratio [HR], 0.47; P .039) (40.5% 22.0%; odds ratio, 3.38; .042) but not 15.4 14.7 HR, 0.89; .68) tumors. Patients G12V did this combination. receiving experienced worse outcomes (response, 22.0% 43.2%; 0.40; .032) than those Effects similar separate Conclusion The addition of to seems G13D‐mutant Relative wild-type lower absolute values. J Clin Oncol 30. © 2012 by American Society Clinical Oncology

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